An improved, easy and efficient method for the generation of nitrile oxides from nitronates for in situ 1,3-dipolar cycloaddition
作者:ing-Yuan Liu、Ming-Chung Yan、Wen-Wei Lin、Lian-Yong Wang、Ching-Fa Yao
DOI:10.1039/a809490j
日期:——
The Michael addition of the diethyl allyl malonate anion to β-nitrostyrenes 1 generated nitronates 5. Nitronates 5 could be converted into nitrileoxides 7 to undergo intramolecular nitrile oxide–olefin cycloaddition (INOC) to form medium to high yields (51–95%) of five-membered carbocycles 8 and 9 by using ethyl chloroformate in the presence of a catalytic amount of 4-dimethylaminopyridine (DMAP)